Prokosch, P. (1990). German saltmarshes - formed by coastal protection, agriculture or nature?, in: Ovesen, C.H. (Ed.) Proceedings of the Second Trilateral Working Conference on Saltmarsh Management in the Wadden Sea Region, Rømø, Denmark, 10-13 October 1989. pp. 35-41, more

Bakker, J.P. (1990). Effects of grazing and hay-making on Wadden Sea saltmarshes, in: Ovesen, C.H. (Ed.) Proceedings of the Second Trilateral Working Conference on Saltmarsh Management in the Wadden Sea Region, Rømø, Denmark, 10-13 October 1989. pp. 51-65, more